Various behaviors can be configured from Settings -> Posting Screen Settings.
You can specify the default Posting privacy which is set when you create a new post.
If set to automatic, the Posting privacy set on the server side of each account will be used.
You can specify whether or not Content Warning (CW) settings are inherited when replying.
You can add, remove, and reorder the tools on the toolbar displayed on the posting screen.
You can customize it according to your own frequency of use.
You can specify the format for attaching Now Playing.